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Q. A Liquid Plumber bottle leaked on my beige limestone bathroom floor. It looks like a wet mark. Is there anything I can try to remove stain? It is a heated floor. A. Liquid Plumber is a very high alkaline substance, which leads our stone expert to... Read More

Q. I am making some improvements to an 87 yr old building with limestone floors. There are some copper stains on the limestone, caused by some moisture and the copper lights bleeding. Please tell me how to clean up this stain. A. Use a soft brush... Read More

Q. I believe I have spill marks of vinegar and also some cleaning solution that stained my marble and limestone floors. I need help in which poultice to use.   A. Marble and limestone are calcium-based stones, which means they are sensitive to acids... Read More

Lichens and mosses produce oxalic acid, which can destroy calcium-based stones. Since they are considered plants, they will also attract moisture, which can cause all kinds of problems with the stone, including spalling. They can also cause the stone... Read More

Think Twice Before Using a Silicon-Based Impregnator on a Historic Limestone Building Limestone, a calcium-based sedimentary stone, is a building material that has been utilized for centuries. The Pentagon, the Lincoln Memorial, The Empire State... Read More

Q. We are building a new house in South Louisiana. We have a 4-inch concrete slab on the ground. Because we are in a flood zone, we had to build up. So, we have concrete piers and wooden beams that our house actually sits on. We then have 1 1/4"... Read More

Q. What is the proper grout for an exterior limestone walkway? Is there a dry grout that can be swept between the stone? Where would I look for stone dust? A. The proper grout will depend on how the stone is set. Will it be set in mortar or placed on... Read More

Q. I'm a park educator (park naturalist) working at a fossil site in Canada. I'm putting together sets of fossils for use in classrooms, including some Green River fish fossils, which are in very soft limestone that flakes in delaminates... Read More

Q. How should I seal my limestone floor? A. Select a quality sealer for stone. Ask your professional stone and tile restoration contractor for recommendations. Initially, three applications or more may be required to seal the stone. To determine... Read More

Q. How do get the stain from furniture polish to come up? We used Scott’s liquid gold and accidentally ended up with a ring on the limestone hearth. A. These type of stains can be difficult to remove. You will need to use a poultice with a... Read More